In this case, the text fields for tags should receive the list of tags separated by colon (above in this document you will see how to change the separator)

Them your document will have the tags and tags_array getter and setter. The tags you use as a plain string with tags separated by colon, the tags_array is an array with tags, these two properties are automatic synchronized.

Tags Indexing

This lib will automatic create for you and index of tags after save the document, this index is useful to get a list of all tags used in documents of this collection or to create a tag cloud. See the following example to understand how to use it: